JP2882948B2 - Sleeve eccentricity compensation device for sleeve type split reinforcing roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for compensating for roll eccentricity due to sleeve eccentricity of a sleeve type split reinforcing roll of a rolling mill.

[0002]

2. Description of the Related Art When a steel sheet is rolled, end elongation or distortion may occur. When end elongation or the like occurs, the roll crown of the rolling roll is changed and adjusted to cope with it.

As a roll capable of changing the roll crown, there is a roll using a sleeve type split reinforcing roll as an upper reinforcing roll of a four-high rolling mill as shown in FIG.

The roll eccentric shaft 51a, a pair of left and right quarter eccentric shafts 51b, and a pair of left and right side eccentric shafts 51c have different eccentric directions and diameters.
Rolling bearings 52a to 52c are fitted to these eccentric shaft portions 51a to 51c, respectively. The outer ring of each of the rolling bearings 52a to 52c is freely rotated by a center reinforcing roll 53a, left and right 1. A pair of quarter reinforcing rolls 53b and a pair of left and right side reinforcing rolls 53
c. A cylindrical sleeve 55 is loosely fitted to the reinforcing rolls 53a to 53c divided in these axial directions. The above members constitute the upper split type reinforcing roll 59.

[0005] Both ends of the roll shaft 51 are supported by a bearing box 56, and a worm wheel 57 and a worm 58 are provided at one end thereof. In the drawing, 50 is an upper work roll, 60 is a lower work roll, 61 is an integrated lower reinforcing roll, and 66 is a bearing box.

FIG. 6 is an explanatory view showing the eccentric state of the upper split type reinforcing roll 59. The axes Oa to Oc of the reinforcing rolls 53a to 53c are eccentric from the axis O of the roll shaft 51, and the side reinforcements are provided. The roll 53c is a center reinforcing roll 53a.
And the diameter is smaller than that of the quarter reinforcing roll 53b.

When the strip 40 is rolled by the rolling mill having the upper split type reinforcing roll 59, the upper work roll 50 is supported by the upper split type reinforcing roll 59 by rolling down the bearing box 56. By appropriately rotating the roll shaft 51 by the worm 58 and the worm wheel 57, an optimum roll crown according to the plate shape of the strip 40 is formed. FIG. 7 shows the change of the crown pattern at the rolling-down position.

[0008]

However, no matter how carefully the sleeve of the sleeve-type split reinforcing roll is manufactured, there is a deviation between the axis of its inner peripheral surface and the axis of its outer peripheral surface (hereinafter referred to as sleeve eccentricity). This causes uneven thickness in the circumferential direction.
In addition, sleeves may be eccentric due to uneven wear with use time.

When the rolled material is rolled using the sleeve-type split reinforcing roll in which such sleeve eccentricity has occurred, the outer peripheral surface of the sleeve periodically moves up and down at the position where the work roll is pressed down, and the lengthwise direction of the rolled material is reduced. , A periodic thickness fluctuation occurs, and the quality is deteriorated.

[0010]

According to the present invention, there is provided a sleeve-type split reinforcement in which a cylindrical sleeve is loosely fitted to an outer surface of an axially split split reinforcing roll capable of changing a roll crown. In a rolling mill equipped with a roll, a rolling force detector that detects a rolling force fluctuation due to sleeve eccentricity and outputs a rolling force fluctuation signal, and a sleeve rotation angle detector that transmits a sleeve rotation angle detection signal according to the rotation of the sleeve. A rolling position detector that detects a rolling position deviation of the rolling device and outputs a rolling position deviation signal, a converter that converts the rolling position deviation signal into a rolling force fluctuation conversion signal, and the rolling force fluctuation signal from the rolling force fluctuation signal. A calculator for subtracting the rolling force fluctuation conversion signal, a sampler for sampling the output of the calculator in synchronization with the sleeve rotation angle detection signal, and a sleeve rotation angle detector The output of the sampler and the sampler is input and the rolling force fluctuation based on the sleeve eccentricity corresponding to each sleeve rotation angle is calculated and stored, and the rolling by the sleeve eccentricity is synchronized with the corresponding sleeve rotation angle in the subsequent sleeve eccentricity cycle. A computer that outputs a compensation signal including a force fluctuation, a converter that converts the compensation signal into a rolling position correction signal, a comparator that compares the rolling position correction signal with the rolling position deviation signal, and a command from the comparator. And a controlled reduction device.

[0011]

In the rolling of a rolled material by a rolling mill using a sleeve type split reinforcing roll, a rolling force detector detects a rolling force variation due to sleeve eccentricity and transmits a rolling force variation signal to a computing unit. The rolling position detector detects the rolling position deviation of the rolling device, transmits the rolling position deviation signal to the comparator, and multiplies the rolling position deviation signal by a rolling force conversion coefficient by a converter to obtain a rolling force fluctuation conversion signal. Convert it and send it to the computing unit. Calculator sends the rolling force variation signals obtained by subtracting the rolling force variation converted signal P _S from the rolling force variation signal P to the sampler.

On the other hand, the sleeve rotation angle detector transmits the rotation angle detection signal to the sampler and the computer. The sampler samples the output signal of the arithmetic unit only when the rotation angle detection signal is sent from the sleeve rotation position detector, and transmits it to the computer. Then, the computer stores the first rotation angle detection signal as the beginning of the first cycle of the sleeve eccentricity. Similarly, the second, third, fourth, etc.
The rolling force fluctuation at the time of receiving the rotation angle detection signal is stored in a computer.

The computer calculates the rolling force fluctuation due to the sleeve eccentricity at each sampling point (when each rotation angle is detected), outputs a compensation signal for the rolling force fluctuation due to the sleeve eccentricity, and transmits the signal to the converter. The converter divides the compensation signal by a rolling force conversion coefficient to convert the signal into a rolling position correction signal, which is transmitted to a comparator. The comparator compares the rolling-down position correction signal with the rolling-down position deviation signal, controls the rolling-down device, and performs plate thickness control that compensates for sleeve eccentricity.

[0014]

FIG. 1 is a cutaway front view of a rolling mill using a sleeve type split reinforcing roll, FIG. 2 is a block diagram showing a configuration of a sleeve eccentricity compensator according to a first embodiment of the present invention, and FIG. 3 is compensation control. FIG. 8 is a diagram showing a rolling force variation due to a sleeve eccentricity. The same members and parts as those of the prior art device are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1, one striker 2 is mounted on one end face of the sleeve 55. No. 1 proximity switch (sleeve rotation angle detector) 1a, No. 2 proximity switch 1b, No. 3 proximity switch 1c, and No. 4 proximity switch 1 are provided on the inner surface of bearing box 56 facing this striker 2.
d are equally arranged in the circumferential direction so as to be close to the striker 2 on the rotation trajectory of the striker 2 due to the rotation of the sleeve 55, and each of the proximity switches 1a to 1d has an ON signal Outgoing. Note that the detection accuracy is improved as the number of the proximity switches 1a to 1d is increased.

The rolling force detector 4 is mounted on the upper surface of both bearing boxes 56, and the rolling cylinder 17 and the rolling position detector 6 are mounted on the lower surface of both lower bearing boxes 66. ing. The rolling force detector 4 outputs a rolling force variation signal P indicating a rolling force variation due to sleeve eccentricity. The rolling position detector 6 outputs a rolling position deviation signal S corresponding to the rolling position deviation of the rolling device.

In FIG. 2, the converter 12 converts the rolling position deviation signal S from the rolling position detector 6 into a rolling force conversion coefficient K _M.
To convert the rolling force into a rolling force fluctuation conversion signal P _S. Arithmetic unit 9
Outputs minus the rolling force variation converted signal P _S from the rolling force variation signal P. The sampler 8 samples the output of the arithmetic unit 9 only when an ON signal is sent from each of the proximity switches 1a to 1d. Proximity switch 1a
If there are n pieces of .about.1d, the ON signal for one piece is set as the beginning of the first cycle of the sleeve eccentricity. This first ON
According to the signal, the rolling force fluctuation signal P is sampled by the sampler 8 via the computing unit 9, converted into a digital amount by the A / D converter 13, and stored in the computer ₁₁ as P ₁₁ . 2 th in the same manner, 3 th, ..., the (n-1) -th ON _{signal, P 12, P 13, ···} P 1 (n-
1) is stored in the computer 11. The end of the first cycle of the sleeve eccentricity, that is, the n-th ON signal causes the computer 11
Stores rolling force variation at that time as P _21.

Further, the computer 11 calculates rolling force fluctuations PR ₁ , PR ₂ , PR ₂ due to sleeve eccentricity at each sampling point.
··· PR (n-1), calculates the PR _n by the following equation.

[0019]

(Equation 1)

It is assumed that PR ₁ = PR _n = 0. This rolling force variation caused by the sleeve eccentric included in the rolling force variation P ₁₁ detected in 1 -th ON signal is to zero it on the basis of a sleeve eccentric, any way loss of generality is not.

In the second cycle of the sleeve eccentricity, the computer 11 stores P ₂₂ , P ₂₃ ,... P _2n in the same manner as in the first cycle, and stores the O of the proximity switches 1a to 1d,.
In synchronization with the N signal, the signal of the rolling force fluctuations PR ₁ , PR ₂ ,..., PR _n due to the sleeve eccentricity obtained by the above calculation is output as a compensation signal B for the rolling force fluctuation due to the sleeve eccentricity. The compensation signal B is converted into an analog signal by the D / A converter 18 and transmitted to the converter 20.

The converter 20 divides the compensation signal B by a rolling conversion coefficient K _M to convert the compensation signal B into a rolling position correction signal C, which is transmitted to the comparator 14. The comparator 14 compares the rolling-down position correction signal C with the rolling-down position deviation signal S from the rolling-down position detector 6, and compares the servo amplifier 15, the servo valve 16,
The thickness of the strip 40 for compensating for sleeve eccentricity is controlled by controlling the rolling device including the rolling cylinder 17 and the rolling position detector 6.

After the end of the second cycle, the rolling fluctuation due to the sleeve eccentricity is calculated in the same manner as in the first cycle, and this is added to the calculated value in the first cycle and corrected. Rolling force fluctuation. In the third cycle,
The same applies to the fourth cycle,....

As described above, as shown in FIG. 3, the rolling force fluctuation due to the sleeve eccentricity compensated for is controlled by the curves in the first cycle T ₁ , the second cycle T ₂ , the third cycle T ₃ ,. It changes into an approximate straight line.

FIG. 4 is a block diagram showing a configuration of a sleeve eccentricity compensator according to a second embodiment of the present invention. This device has one proximity switch, and has n strikers 2a, 2b, 2c, 2d,.
Is mounted, and n rotations of the sleeve 55 are performed in one rotation of the sleeve 55, similarly to the pulse generator for detecting the rotation angle of the shaft.
Transmit N signal. Then, the ON signal is counted by the counter 10 and stored in the computer 11 and reset by the signal A from the computer 11. Other configurations and operations are the same as those of the first embodiment.

In the above description, the rolling force fluctuation obtained in the first cycle of the sleeve eccentricity is used for compensation control in the immediately following second cycle, and the rolling force fluctuation due to the sleeve eccentricity corrected in the second cycle is obtained in the third cycle. Is used for compensation control in (1), but when it takes time to calculate rolling force fluctuation due to sleeve eccentricity in the computer, the sleeve eccentricity in the second cycle is calculated from the rolling force fluctuation stored in the first cycle. To calculate the pressure fluctuation due to
The period may be delayed.

[0027]

According to the present invention, a rolling mill using a sleeve type split reinforcing roll detects rolling force fluctuations and rolling position deviations at each rotation angle of the sleeve and periodically compensates for the eccentricity of the sleeve to reduce the rolling. By providing the sleeve eccentricity compensating device for controlling the device, even if the rolled material is rolled using the sleeve type split reinforcing roll in which the sleeve eccentricity has occurred, the thickness does not change in the length direction. Therefore, a rolled material having a uniform thickness in the length direction can be obtained.

[Brief description of the drawings]

FIG. 1 is a cutaway front view showing a rolling mill using a sleeve type split reinforcing roll to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a sleeve eccentricity compensator according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a rolling force variation due to a sleeve eccentricity that has been subjected to compensation control.

FIG. 4 is a block diagram showing a configuration of a sleeve eccentricity compensator according to a second embodiment of the present invention.

FIG. 5 is a cutaway front view showing a conventional sleeve-type split reinforcing roll rolling mill.

FIG. 6 is an explanatory diagram showing an outer diameter and an eccentric state of each divided reinforcing roll of a conventional rolling mill.

FIG. 7 is a characteristic diagram showing a crown pattern at each angle of a conventional split reinforcing roll.

[Explanation of symbols]

Reference Signs List 1 proximity switch (sleeve rotation angle detector) 1a No.1 proximity switch 1b No.2 proximity switch 1c No.3 proximity switch 1d No.4 proximity switch 2,2a, 2b, 2c, 2d striker 4 rolling force detector 6 Roll-down position detector 8 Sampler 9 Computing unit 11 Computer 12 Converter 14 Comparator 15 Servo amplifier 16 Servo valve 17 Roll-down cylinder 40 Strip 55 Sleeve 59 Upper split type reinforcing roll B Compensation signal S Roll-down position deviation signal P Rolling force fluctuation signal P _S Rolling force fluctuation conversion signal

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 37/00 B21B 27/03

Claims (1)

(57) [Claims] 1. A rolling mill equipped with a sleeve-type split reinforcing roll in which a cylindrical sleeve is loosely fitted on an outer surface of an axial split split reinforcing roll capable of changing a roll crown, wherein a rolling force variation due to sleeve eccentricity is reduced. A rolling force detector that detects and outputs a rolling force fluctuation signal, a sleeve rotation angle detector that transmits a sleeve rotation angle detection signal in accordance with the rotation of the sleeve, and a rolling position deviation that detects a rolling position deviation of the rolling device. A rolling position detector that outputs a signal, a converter that converts the rolling position deviation signal into a rolling force fluctuation conversion signal, a calculator that subtracts the rolling force fluctuation conversion signal from the rolling force fluctuation signal, and a sleeve rotation angle. A sampler for sampling the output of the arithmetic unit in synchronization with the detection signal; and inputting the output of the sleeve rotation angle detector and the sampler to each of the sleeves. A calculator that calculates and stores a rolling force variation based on the sleeve eccentricity corresponding to the angle, and outputs a compensation signal including a rolling force variation due to the sleeve eccentricity in synchronization with the corresponding sleeve rotation angle in a subsequent sleeve eccentricity cycle; A converter for converting a compensation signal into a rolling position correction signal, a comparator for comparing the rolling position correction signal with the rolling position deviation signal, and a rolling device controlled by a command from the comparator. Sleeve eccentricity compensation device for sleeve type split reinforcing roll.